Re: Converting from local DST to UTC

[Karen Tracey]

On Wed, Apr 22, 2009 at 2:42 AM, vicky  wrote:

>
> Hi,
>
> I am new in django. I need to update events from my website to
> outlook, Google, yahoo calendars. I have implemented some code from
> vObject which download ".ics" file which is OK for outlook. I don't
> know how to update event in Google and yahoo calendar.
>
> Please help me.
>

You'd be better off asking for help in forums for those tools (Google and
yahoo calendar). How to update events for them has nothing to do with
Django.

Karen

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Re: Converting from local DST to UTC

[vicky]

On Apr 15, 10:04 pm, Jamie  wrote:
> On Apr 14, 9:34 pm, Brian Neal  wrote:
>
> > This is how I am doing it (I'm also integrating with Google Calendar):
> 
> > tz = pytz.timezone(tz_name)  # create timezone
> > local = tz.localize(d)  # make naive datetime localized
> > zulu = local.astimezone(FixedOffset(0))  # convert to UTC
> > s = zulu.strftime('%Y-%m-%dT%H:%M:%S.000Z')
>
> tz.localize() did the trick.
>
> I was using naive_datetime.replace(tzinfo = tz) to convert from naive
> to a localized time. Once I changed that to tz.localize
> (naive_datetime), it worked perfectly.
>
> Thanks for the help!


Hi,

I am new in django. I need to update events from my website to
outlook, Google, yahoo calendars. I have implemented some code from
vObject which download ".ics" file which is OK for outlook. I don't
know how to update event in Google and yahoo calendar.

Please help me.

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Re: Converting from local DST to UTC

[Jamie]

On Apr 14, 9:34 pm, Brian Neal  wrote:
> This is how I am doing it (I'm also integrating with Google Calendar):

> tz = pytz.timezone(tz_name)  # create timezone
> local = tz.localize(d)  # make naive datetime localized
> zulu = local.astimezone(FixedOffset(0))  # convert to UTC
> s = zulu.strftime('%Y-%m-%dT%H:%M:%S.000Z')

tz.localize() did the trick.

I was using naive_datetime.replace(tzinfo = tz) to convert from naive
to a localized time. Once I changed that to tz.localize
(naive_datetime), it worked perfectly.

Thanks for the help!
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Re: Converting from local DST to UTC

[Brian Neal]

On Apr 14, 7:26 pm, Jamie  wrote:
> I am working on an app that will export a calendar event to Google
> Calendar. Google Calendar requires that event datetimes be in UTC
> format. I can make the conversion from local (America/New_York) to UTC
> using pytz, but the time is off by an hour due to daylight savings
> time (Python thinks the offset is -0500 rather than -0400) so all of
> my exported events are off as a result.

pytz does adjust for daylight savings time, that is one of its primary
jobs.

>
> I'm first taking the naive datetime stored by Django and adding the
> local timezone pulled from settings.py then using astimezone(pytz.utc)
> to make the conversion to UTC. I'm not sure how to adjust for DST,
> especially since all the events will be in the future and DST will
> have to be calculated for each of them.

Try using 'US/Eastern' instead of 'America/New_York'. It might be
different.

This is how I am doing it (I'm also integrating with Google Calendar):

from django.utils.tzinfo import FixedOffset

d = datetime.datetime.now()
tz_name = 'US/Eastern'  # or whatever
tz = pytz.timezone(tz_name)  # create timezone
local = tz.localize(d)  # make naive datetime localized
zulu = local.astimezone(FixedOffset(0))  # convert to UTC
s = zulu.strftime('%Y-%m-%dT%H:%M:%S.000Z')

I think I probably could have used pytz.utc instead of FixedOffset(0).
It's the same idea. But at least now this thread has Django
content. :-)

Hope that helps,
BN





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